:root {
  --bg: #0d1117;
  --bg2: #131a23;
  --panel: #161e29;
  --border: #243044;
  --text: #dbe4f0;
  --muted: #8494ab;
  --accent: #58e6b0;
  --accent2: #4cc3ff;
  --mark: rgba(88, 230, 176, .28);
  --err: #ff6b81;
  --radius: 10px;
  --mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
  line-height: 1.55;
}
.mono, code, input[type="text"], textarea, output { font-family: var(--mono); }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: .7rem clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  position: sticky; top: 0; z-index: 10;
}
.brand { display: flex; align-items: center; gap: .55rem; font-weight: 700; letter-spacing: .02em; }
.topbar nav a {
  color: var(--muted); text-decoration: none; margin-left: 1.2rem;
  font-size: .85rem; letter-spacing: .06em; text-transform: uppercase;
  transition: color .2s;
}
.topbar nav a:hover { color: var(--accent); }

.hero { max-width: 1100px; margin: 0 auto; padding: 2.2rem clamp(1rem, 4vw, 2.5rem) 1.4rem; }
.hero h1 {
  font-size: clamp(1.9rem, 5vw, 3.1rem);
  letter-spacing: -.02em; line-height: 1.1;
  background: linear-gradient(100deg, var(--accent), var(--accent2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  animation: rise .5s ease both;
}
.hero p { color: var(--muted); max-width: 46rem; margin-top: .6rem; animation: rise .5s .08s ease both; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

.tool {
  max-width: 1100px; margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem) 1.5rem;
  animation: rise .5s .16s ease both;
}
.pattern-bar { display: flex; align-items: center; gap: .8rem; flex-wrap: wrap; margin-bottom: .5rem; }
.lbl { font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.pattern-input {
  flex: 1; min-width: 260px; display: flex; align-items: center; gap: .15rem;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: .45rem .7rem; transition: border-color .2s, box-shadow .2s;
}
.pattern-input:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(88,230,176,.12); }
.slash { color: var(--accent); font-family: var(--mono); font-weight: 700; }
#patron {
  flex: 1; background: none; border: none; outline: none; color: var(--text);
  font-size: 1rem; min-width: 80px;
}
.flag {
  width: 30px; height: 30px; border-radius: 7px; border: 1px solid var(--border);
  background: transparent; color: var(--muted); cursor: pointer;
  font-family: var(--mono); font-weight: 700; font-size: .85rem;
  transition: all .18s;
}
.flag.on { background: var(--accent); color: var(--bg); border-color: var(--accent); }
.flag:hover { transform: translateY(-1px); }
.contador { font-size: .82rem; color: var(--accent); white-space: nowrap; }

.error {
  background: rgba(255,107,129,.1); border: 1px solid rgba(255,107,129,.35);
  color: var(--err); border-radius: var(--radius);
  padding: .5rem .8rem; font-size: .88rem; margin-bottom: .6rem;
}

.panels {
  display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: .8rem;
  align-items: stretch;
}
.panel {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: .8rem;
  display: flex; flex-direction: column; gap: .5rem; min-width: 0;
}
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; }
.panel-head h2, .panel-head h3 {
  font-size: .72rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted);
}
.panel-head.sub { margin-top: .3rem; }
.badge {
  background: var(--accent); color: var(--bg); font-weight: 700;
  border-radius: 999px; padding: .05rem .55rem; font-size: .78rem;
}
.btn-mini {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  border-radius: 7px; padding: .25rem .6rem; font-size: .75rem; cursor: pointer;
  letter-spacing: .05em; transition: all .18s;
}
.btn-mini:hover { color: var(--accent); border-color: var(--accent); }

textarea {
  width: 100%; height: 130px; resize: vertical;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); padding: .6rem; font-size: .88rem; outline: none;
  transition: border-color .2s;
}
textarea:focus { border-color: var(--accent2); }
#reemplazo {
  width: 100%; background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; color: var(--text); padding: .45rem .6rem; font-size: .85rem; outline: none;
}
#reemplazo:focus { border-color: var(--accent2); }
.replace-out-wrap {
  display: flex; align-items: center; gap: .5rem;
  background: var(--bg); border: 1px dashed var(--border); border-radius: 8px;
  padding: .4rem .6rem; min-height: 2.2rem;
}
.out-lbl { font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted); flex-shrink: 0; }
output { font-size: .8rem; overflow-wrap: anywhere; min-width: 0; flex: 1; }

.matches { list-style: none; overflow-y: auto; max-height: 262px; display: flex; flex-direction: column; gap: .4rem; }
.matches li {
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  padding: .4rem .55rem; font-size: .8rem; transition: border-color .18s;
}
.matches li:hover { border-color: var(--accent); }
.idx {
  display: inline-block; background: var(--accent); color: var(--bg);
  border-radius: 5px; font-weight: 700; font-size: .7rem; padding: 0 .35rem; margin-right: .4rem;
}
.mtext { color: var(--accent); overflow-wrap: anywhere; }
.pos { color: var(--muted); font-size: .72rem; }
.grupos { display: block; margin-top: .25rem; color: var(--text); overflow-wrap: anywhere; }
.grupos code { color: var(--accent2); }
.grupos.sin { color: var(--muted); font-style: italic; }
.empty { color: var(--muted); font-size: .82rem; font-style: italic; }

.explicacion { list-style: none; overflow-y: auto; max-height: 300px; display: flex; flex-direction: column; gap: .3rem; }
.explicacion li {
  display: flex; gap: .55rem; align-items: baseline;
  background: var(--bg); border: 1px solid var(--border); border-radius: 7px;
  padding: .3rem .5rem; font-size: .78rem;
}
.explicacion code { color: var(--accent2); white-space: pre; flex-shrink: 0; min-width: 2ch; }
.explicacion li.error { border-color: var(--err); }
.explicacion li.error code { color: var(--err); }

.highlight-zone {
  margin-top: .8rem; background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: .7rem .9rem;
  display: flex; flex-direction: column; gap: .4rem;
}
.resaltado {
  white-space: pre-wrap; overflow-wrap: anywhere; font-size: .88rem;
  max-height: 150px; overflow-y: auto; color: var(--text);
}
.resaltado mark {
  background: var(--mark); color: var(--accent);
  border-bottom: 2px solid var(--accent); border-radius: 3px; padding: 0 .1em;
}

.content { max-width: 800px; margin: 0 auto; padding: 1.6rem clamp(1rem, 4vw, 2.5rem); }
.content h2 { font-size: 1.4rem; letter-spacing: -.01em; margin-bottom: .7rem; }
.content p { color: var(--muted); margin-bottom: .6rem; }
.content code {
  background: var(--panel); border: 1px solid var(--border); border-radius: 5px;
  padding: .05rem .35rem; font-size: .85em; color: var(--accent);
}
.pasos { padding-left: 1.3rem; color: var(--muted); display: flex; flex-direction: column; gap: .45rem; }
.pasos strong { color: var(--text); }

.ejemplos-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: .7rem; }
.ejemplo {
  text-align: left; background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: .7rem .8rem; cursor: pointer;
  color: var(--text); display: flex; flex-direction: column; gap: .3rem;
  transition: transform .18s, border-color .18s;
}
.ejemplo:hover { transform: translateY(-2px); border-color: var(--accent); }
.ejemplo strong { font-size: .92rem; }
.ejemplo code {
  font-size: .74rem; color: var(--accent2); overflow-wrap: anywhere;
  background: none; border: none; padding: 0;
}

details {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: .7rem .9rem; margin-bottom: .5rem;
}
details summary { cursor: pointer; font-weight: 600; }
details p { margin-top: .5rem; }

.footer {
  border-top: 1px solid var(--border); margin-top: 1.5rem;
  padding: 1.4rem clamp(1rem, 4vw, 2.5rem); text-align: center;
  color: var(--muted); font-size: .85rem;
}
.footer nav a { color: var(--muted); text-decoration: none; }
.footer nav a:hover { color: var(--accent); }

@media (max-width: 960px) { .panels { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px) {
  .panels { grid-template-columns: 1fr; }
  .topbar nav a { margin-left: .8rem; font-size: .75rem; }
  textarea { height: 110px; }
  .matches, .explicacion { max-height: 200px; }
}